Address PR #1214 code review feedback

- Fix template-expanded URIs not rendering: construct synthetic Resource
  from readState.uri when the URI is absent from the resources list
- Fix non-image blob content rendering raw base64: show placeholder
  message; also handle audio blobs properly
- Hide mimeType display when multiple content items to avoid confusion
- Rename ResourceControls selectedTemplate → selectedTemplateUri for
  consistency with selectedUri and selectedResourceUri

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/web/src/components/groups/ResourceControls/ResourceControls.tsx

@@ -22,7 +22,7 @@ export interface ResourceControlsProps {
   templates: ResourceTemplate[];
   subscriptions: InspectorResourceSubscription[];
   selectedUri?: string;
-  selectedTemplate?: string;
+  selectedTemplateUri?: string;
   listChanged: boolean;
   onRefreshList: () => void;
   onSelectUri: (uri: string) => void;
@@ -46,7 +46,7 @@ export function ResourceControls({
   templates,
   subscriptions,
   selectedUri,
-  selectedTemplate,
+  selectedTemplateUri,
   listChanged,
   onRefreshList,
   onSelectUri,
@@ -137,9 +137,9 @@ export function ResourceControls({
                   <ResourceListItem
                     key={template.uriTemplate}
                     resource={template}
-                    selected={template.uriTemplate === selectedTemplate}
+                    selected={template.uriTemplate === selectedTemplateUri}
                     onClick={() => {
-                      if (template.uriTemplate !== selectedTemplate)
+                      if (template.uriTemplate !== selectedTemplateUri)
                         onSelectTemplate(template.uriTemplate);
                     }}
                   />

clients/web/src/components/groups/ResourcePreviewPanel/ResourcePreviewPanel.tsx

@@ -30,7 +30,13 @@ function toContentBlock(
   if (mimeType.startsWith("image/")) {
     return { type: "image", data: item.blob, mimeType };
   }
-  return { type: "text", text: item.blob };
+  if (mimeType.startsWith("audio/")) {
+    return { type: "audio", data: item.blob, mimeType };
+  }
+  return {
+    type: "text",
+    text: `[Binary content (${mimeType}) — preview not supported]`,
+  };
 }
 
 function formatLastUpdated(date: Date): string {
@@ -113,7 +119,7 @@ export function ResourcePreviewPanel({
         ) : (
           <Spacer />
         )}
-        <MimeText>{mimeType}</MimeText>
+        {contents.length <= 1 && <MimeText>{mimeType}</MimeText>}
       </MetaRow>
       <FooterRow>
         <AnnotationGroup>